[Patch, fortran] PR27900 - ICE using intrinsics as arguments

[Paul Thomas]

:ADDPATCH fortran:

After quite a lot of worrying at this one by both FX and myself, the fix 
turns out to be quite simple and self explanatory.  The testcase is a 
slight development of the reporter's.

Bootstrapped and regtested on ia64/FC5 - OK for trunk and 4.2?

Paul
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